Lamp



FIG. 1 is a perspective view of a lamp from below the lamp shade;

FIG. 2 is a perspective view of the lamp from above the lamp shade;

FIG. 3 is an enlarged top plan view of FIG. 1; and,

FIG. 4 is an enlarged bottom plan view of FIG. 1.

The elements shown in broken lines form no part of the claimed design. 

The ornamental design for a lamp, as shown and described. 